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    <meta charset="UTF-8">
    <meta name="viewport" content="width=device-width, initial-scale=1.0">
    <title>Document</title>
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    <script>
        //  + - * /
        console.log(1+1);
        console.log(1-1);
        console.log(5*20);
        console.log(100/2);
        // 取余
        console.log(10%3);
        console.log(9%3);
        // 特殊情况(不再是运算了)
        console.log('马超'+10);
        console.log('马超'-10);//NaN不是一个数字
         
    </script>
</body>
</html>